Public bug reported:
When upgrading from 19.10 (w/ LVM + encypted disks) to 20.04, the
installer hangs when trying to probe an LVM snapshot volume created
before the upgrade.
Steps to reproduce:
lvcreate -s -L 20G -n preupgrade /dev/vgubuntu/root
do-release-upgrade -d
The installer will hang after the following message:
/usr/sbin/grub-probe: error: unknown filesystem.
Found Ubuntu 19.10 (19.10) on /dev/mapper/vgubuntu-preupgrade
done
Resolution:
Killing the grub-mount process which is probing the LVM snapshot seems
to unhang the installer and allow the upgrade to complete without issue.
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
** Tags: eoan2focal
** Attachment added: "Contents of /var/log/dist-upgrade"
https://bugs.launchpad.net/bugs/1876506/+attachment/5365254/+files/dist-upgrade-logs-20200502.tgz
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https://bugs.launchpad.net/bugs/1876506
Title:
eoan to focal upgrade hangs when lvm snapshot is present
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